JPS58175273A - Coaxial movable contact probe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coaxial type movable contact globe that can obtain good electrical characteristics in testing packages used for high frequency bands from the HF band.

1, 2, and 3 show the structure and usage example of a conventional contact glove for testing the circuit characteristics of a high-frequency package mounted on a circuit board. FIG. 1 shows a longitudinal vertical cross section of the contact globe in the first conventional embodiment, where 1m is a movable contact for contacting the pattern on the substrate, 1b is a movable contact for grounding, and 2a r 2b are movable contacts. Sockets for guiding the contact 1a and the ground movable contact 1b) 1. ? a...? b is a spring for holding down the movable contact 1a and the movable grounding contact 1b, 4 is a coaxial cable, 5 is an internal conductor of the coaxial cable 4 connected to the movable contact 1a, and 6 is a fixed spring for fixing the socket 2. It is a fixture that FIG. 3 shows an example of how the contact glove shown in FIG. 1 is used. In Figure 3, 101
is a high frequency component, 102 is a board, and 103 is a circuit on the board.
The other symbols are the same as those in FIG. 1, and the diagram shows the case where simultaneous multi-point measurement is performed using a plurality of contact gloves (only two are shown in the figure) shown in FIG. In this case, the test is performed by moving the substrate 102 or the fixture 6 upward or downward to bring the movable contact 1a and the grounding movable contact 1b into contact with the pattern 103. The movable contact 1a and the grounding movable contact 1b each have a spring 3 a r 3 provided at their upper end.
b is pressed against the pattern 103 on the substrate to improve contact. However, in the case of the above-mentioned conventional embodiment, the connection from the tip of the movable contact 1 to the internal conductor 5 is made by a signal line that does not have the structure of a coaxial cable. Significant signal level attenuation will occur. Furthermore, since there is no shielding between the tip of the movable contact 1 and the internal conductor 5, crosstalk occurs between adjacent contact globes when performing simultaneous multi-point measurements as shown in Figure 3, resulting in negative effects. resulting in disadvantages.

FIG. 2 shows a second conventional embodiment of the contact globe, in which the internal conductor 5 of the coaxial cable 4 is directly used as a contact without using the movable contact 1a. Shows the same thing as the figure. In the second embodiment in which the internal conductor 5 of the coaxial cable 4 is used as a contact, it is possible to prevent signal level attenuation and crosstalk, but as shown in FIG. This has the drawback that stable contact cannot be achieved due to the sag, the sag of the fixture 6, the fixed position of the coaxial cable 4, the flatness of other jigs, etc.

In order to solve the above-mentioned drawbacks, the present invention provides a movable contact that has the same effect as the internal conductor of a coaxial cable, and will be described in detail below.

FIG. 4(a) is a vertical cross section in the longitudinal direction showing the first embodiment of the coaxial movable contact glove according to the present invention, in which 1 is a movable contact, 2 is a conductor socket, 3 is a spring, and 7 is a The outer conductor 8 is a dielectric material. The outer conductor 7 has a cylindrical shape, and has a connector attachment part formed at its upper end so that it can be connected to a coaxial cable.A socket 2 is inserted into the center of the outer conductor 7, and a spring 3 is inserted into the inside of the socket 2. A movable contactor 1 is provided which is held and electrically connected by.

The movable contact 1 protrudes from the lower end of the external conductor 7, can move up and down using the socket 2 as a guide, and can come into contact with the circuit pattern on the board when pressed by the spring 3. FIG. 4(b) shows a cross section of the coaxial movable contact 1 globe shown in FIG. 4(,) along the dashed line A-AA plane, and each symbol is the same as in FIG. 4(,). As shown in FIG. 4(b), the inner diameter of the outer conductor 7 is D, the outer diameter of the socket 2 is d, the impedance of the coaxial cable connected to it is zc, the permittivity of the dielectric material 8 is ε, and the magnetic permeability is It is known that each relationship is expressed by the following equation, where μ is μ.

Z c-T Log, 7 Here, η=4 Therefore, the relationship between the inner diameter of the outer conductor 2 and the outer diameter d of the socket 2 should satisfy the relationship shown in equation (1), and the glove part should be the same as the coaxial cable. Each impedance is kept matched.

FIG. 5 shows an example of the use of the coaxial type movable contact glove shown in FIG. 4, and shows a cross section seen from the side. In Fig. 5, 4 is a coaxial cable, 6 is a fixture, 9 is a coaxial movable contact globe, 10 is a high frequency component, 102 is a board, 10
3 is a circuit/'P turn, 104 is a connector for connecting the coaxial cable 4 and the coaxial type movable contact globe 9, and 105 is a ground, and the coaxial type movable contact globe 9 shown in FIG.
This shows a case where simultaneous multi-point measurement is performed using a plurality of (only two are shown in the figure). A plurality of coaxial movable contact globes 9 are fixed to the fixture 6, each connected to the coaxial cable 4 by a connector 104, and held by the spring 3 by moving the substrate 102 or the fixture 6 upward or downward. The movable contact 1 can be brought into good contact with the nine turns 103.

In the first embodiment described above, the contactor 1 has a structure that has the same effect as the internal conductor of a coaxial cable, so
Not only can good characteristics be obtained in simultaneous multi-point measurements, but also the crosstalk phenomenon is reduced and has the advantage of not affecting other probes and package circuits. Furthermore, unlike the conventional contact probes shown in FIGS. 1 and 2, a movable contact for grounding is not provided, and grounding is separately performed by other means (in the above embodiment, a movable contact for grounding is not provided). (from the ground 105), it can be applied to packages with high density packaging and a small space area without impairing operability.

FIG. 6(,) shows a second embodiment of the coaxial movable contact glove according to the present invention, and shows a vertical cross section in the longitudinal direction similarly to FIG. In the figure, 3a is a spring held at the upper part of the movable contact 1, and 10 is a movable earthing contact that is provided around the outer lower part of the outer conductor 7 and is held with the outer conductor 2 by a sedge ring 3b. , the movable contactor 1 protrudes from the center of its bottom, and a groove for escaping a circuit pattern or components is provided at the bottom. When making contact with the circuit/zoom turn on the board, the movable contact 1 at the center and the movable grounding contact 10 are pressed against the measurement part of each circuit pattern, and the compressive repulsive force of the spring Jan3b ensures good contact. be done.

FIG. 6(b) shows a horizontal cross section of the coaxial movable contact probe along the dashed line B-BH shown in FIG. 6(,), and each symbol is the same as that in FIG. 6(,). In the case of Fig. 4, only the movable contact is placed directly on the board. In this method, a movable contact for grounding is not provided as the grounding is made by contacting the turn and the grounding is taken separately by other means, but in the embodiment of wooden tablet 2, a movable contact 1 is provided which has the same effect as the internal conductor of a coaxial cable. At the same time, a grounding movable contact 10 having a component escape groove is provided at the bottom of the lower end. Therefore, compared to the first embodiment shown in FIG. 4, the shielding effect and impedance matching are improved, signal crosstalk and signal level attenuation are further reduced, and better characteristics can be obtained.

The coaxial movable contact probe shown in Fig. 7(,)(b) has a movable contact and a movable grounding contact. This probe has the same effect as the coaxial movable contact probe shown in FIG. 6, except that it is narrower than the probe shown in FIG.

In the present invention, since the movable contactor has a coaxial structure, it is possible to prevent crosstalk of high frequency signals and attenuation of the signal level.
Since it can measure good electrical characteristics and has a movable contact structure using a spring, it has the advantage of providing stable contact even when applied to simultaneous multi-point measurements.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a contact globe in a first conventional embodiment, FIG. 2 is a vertical sectional view of a contact globe in a second conventional embodiment, and FIG. 3 is a vertical sectional view of a contact globe in a conventional second embodiment. FIG. 4(a) is a side view showing an embodiment in which multi-point measurement is performed. FIG. 4
5 is a side view showing an embodiment in which simultaneous multi-point measurement is performed using a coaxial movable contact glove according to the first embodiment of the present invention; FIG. , FIG. 7 is a longitudinal vertical sectional view of a coaxial movable contact globe according to a second embodiment of the invention. 1...Movable contact, 2...Socket), J+3
a + J b...Spring, 4...Coaxial cable,
5... Inner conductor of coaxial cable 4, -... Fixture, 7... Outer conductor, 8... Dielectric material, 9...
・Coaxial type movable contact probe, 10, 10a... Movable contact for grounding, 10... High frequency parts, 102...
- Board, 103... circuit or turn, 104 connector, 105... ground. (OJ (CI) (b+
(b) Procedural amendment (Own ship 57.8.18 To the Commissioner of the Japan Patent Office, 18/08/1939), Indication of the case 1982 Patent Application No. 056641 2, Name of the invention Coaxial movable contact Zorope 3, Make amendments. Relationship with the patent case Patent application office (105) 1-7-12-4 Toranomon, Minato-ku, Tokyo
, Agent address (105) 1-74 Toranomon, Minato-ku, Tokyo @
Contents of amendment 6 of No. 12
-The phrase “shows the cross section on the AA plane” has been corrected to “shows the bottom cross section.” (2) On page 8, line 11 of the Ministry of Foreign Affairs, the phrase "shows the horizontal cross section on the dashed-dotted line B-BB plane" has been replaced with "shows the bottom cross section".
and correct it. (3) r A-AA on page 10, lines 3 to 4 of the same book
``Cross section at'' is corrected to ``Lower cross section view''. (4) Figure 4 (,) of the drawings will be amended as shown in the attached sheet. (5) Figure 6(a) of the drawing shall be amended as shown in the attached sheet. (6) Drawings Figures 7(a) and 7(b) will be corrected as shown in the attached sheet. Figure 4 Figure 6 (0) (b) (0) (bl

Claims (2)

[Claims] (1) A hollow cylindrical outer conductor provided with a connector that can be connected to a coaxial cable at one end, a hollow cylindrical socket provided in a coaxial structure with a dielectric material sandwiched inside the outer conductor, and a movable contact that can be operated while being guided by the socket, one end of which is held by a spring that is electrically connected to the socket, and the other end of which is provided so as to protrude from the opposite end of the connector mounting portion of the external conductor. A coaxial movable contact glove characterized by: (2) A hollow cylindrical outer conductor with a connector at one end that can be connected to a coaxial cable, and a hollow cylinder with one end open, with an opening loosely fitted on the outside of the opposite end of the outer conductor to the connector attachment part. The opening end loosely fitted is held to the external conductor via a spring, and the component escape groove gate is provided on the bottom of the opposite closed end, and a movable grounding contact that can operate with the external conductor as a guide, and the external conductor. a cylindrical socket provided in a coaxial structure with a dielectric material sandwiched inside the socket; A coaxial type movable contact glove comprising a movable contact protruding from a bottom surface of a closed end of a movable grounding contact.